bit slice chips (was Re: Harris H800 Computer)

-----Original Message----- From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jecel Assumpcao Jr. Sent: Friday, April 22, 2016 10:54 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: bit slice chips (was Re: Harris H800 Computer) Eric Smith mentioned: I'd add the Texas Instruments SN74S481, SN54LS481 and SN74LS481 TTL 4 bit slices. The Schottky version had a 90ns clock cycle and the low power versions 120ns. These were 48 pins chips and didn't have an internal register bank like the 2901. The idea was that you implemented a memory to memory architecture like the TMS9900. The TI SBP0400A and SBP0401A were I2L 4 bit slices. The 400 had an internal pipeline register while the 401 was designed for external pipelining. ALU operations took 240ns at 200mW. It had an 8 register bank besides the working register. All I know about these is what I read in "The Bipolar Micromputer Components Data Book", December 1977 edition. I have no idea if these chips were actually shipped or if they were used in any product. -- Jecel ----- Also the later Texas Instruments SN74AS888 (8-bit ALU slice w/ 16x8 register file and multiply/divide/normalize) & SN74AS890 (sequencer). Did these ever get any commercial traction? paul